Side formwork erecting structure of cast-in-place box culvert in confined space

Abstract

The present application relates to the technical field of municipal pipeline renovation, and in particular to a side formwork erecting structure of a cast-in-place box culvert in a confined space. The side formwork erecting structure comprises steel sheet piles, an outer formwork, an inner formwork and a connecting assembly, wherein the plurality of steel sheet piles are inserted into an excavated trench, the outer formwork is located on the inner side of the steel sheet piles, and the steel sheet piles support the outer formwork; the inner formwork is located on the inner side of the outer formwork, a gap is reserved between the inner formwork and the outer formwork, and the inner formwork is configured for the arrangement of a reinforcing mesh and pouring of concrete; and the connecting assembly is arranged on the outer formwork and is configured to connect to the inner formwork. The present application has the effect of saving on a construction space.

Description

A side formwork structure for cast-in-place box culvert in confined space Technical Field

[0001] The present application relates to the technical field of municipal pipeline reconstruction, and in particular to a side formwork structure for a cast-in-place box culvert in a confined space. Background Art

[0002] Municipal pipeline renovation involves updating, upgrading, or replacing various urban pipelines to improve their functionality, safety, and sustainability. The renovated pipelines are located along major urban arterial roads. Due to factors such as construction space, construction time, and traffic, extensive damage to existing roads is not feasible during construction. This would block the roads and disrupt urban traffic.

[0003] Currently, when removing the outer formwork of a box culvert, the diagonal supports are first removed, the bolts are removed, and the formwork is gently pried to separate the concrete from the formwork. A crane is then used to remove the formwork. However, due to space limitations on municipal road construction, the working width must be optimized. During the construction of drainage box culverts on municipal roads, road occupation is often subject to time constraints. Therefore, reasonable construction deadlines and traffic control measures must be arranged to minimize traffic impacts. Based on this situation, a side support formwork structure for cast-in-place box culverts within confined spaces is proposed. Utility Model Content

[0004] In order to save construction space, the present application provides a side support formwork structure for a cast-in-place box culvert in a confined space.

[0005] The side formwork structure of the cast-in-place box culvert in a confined space provided in the present application includes steel sheet piles, outer formwork, inner formwork and connecting components. A plurality of the steel sheet piles are inserted in the excavated trench, the outer formwork is located on the inner side of the steel sheet piles, and the steel sheet piles support the outer formwork; the inner formwork is located on the inner side of the outer formwork and a gap is left between the inner formwork and the outer formwork for arranging steel mesh and pouring concrete; the connecting component is arranged on the outer formwork for connecting the inner formwork.

[0006] By adopting the above technical solution, when repairing municipal pipelines, a trench is dug in the ground, and then a plurality of steel sheet piles are sequentially inserted into the excavated trench, so that the outer formwork abuts the inner side of the steel sheet piles. The steel mesh is then arranged, and the inner formwork is then installed on the side of the steel mesh away from the outer formwork. The inner and outer formworks are then connected via a connecting assembly, and then the concrete is poured. With the above arrangement, there is no need to remove the formwork, and there is no need to remove the lifting equipment, thereby reducing space occupancy, shortening the road occupation time, and reducing the impact on traffic. At the same time, the excavation is small, and the optimization of the formwork process means that the outer formwork does not need to be removed, and can be permanently left in the foundation pit for support, and it is convenient to subsequently pull out the steel sheet piles. This is because the steel sheet piles only need to be pulled out of the channel steel groove and do not need to be disconnected from the outer formwork. This side formwork process can reduce the disassembly work and operational complexity during the construction process, achieving the purpose of saving construction space, reducing costs, shortening construction period, and improving construction efficiency.

[0007] Optionally, polystyrene boards are filled between the steel sheet piles and the outer formwork.

[0008] By adopting the above technical solution, steel sheet piles are used as the support for the outer formwork of the box culvert, and 20mm polystyrene boards are filled between the steel sheet piles and the box culvert to facilitate the subsequent removal of the steel sheet piles and the subsequent recycling of the steel sheet piles.

[0009] Optionally, the connecting assembly includes a limit member, a water-stop screw and a nut, the water-stop screw passes through the outer template and the inner template and is threadedly connected to the nut, and the limit member is arranged on the water-stop screw and is located on the side of the outer template away from the inner template.

[0010] By adopting the above technical solution, once both the outer and inner formwork are in place, the waterstop screw is passed through the outer and inner formwork, and then a nut is attached to the waterstop screw and rotated to force the stopper against the outer formwork. The provided connection assembly has a simple structure and, through the arrangement of the connection assembly, the outer and inner formwork are fixed together to form a whole, facilitating concrete pouring.

[0011] Optionally, the limiting member is a cross steel bar.

[0012] The provision of cross steel bars makes it easier to correct the inner formwork through the outer formwork, increases the contact area, and improves the stability of the outer and inner formworks.

[0013] Optionally, a first limiting ring and a second limiting ring are provided on the waterstop screw, the first limiting ring is located on the side of the outer template away from the inner template, and the second limiting ring is provided on the side of the inner template close to the outer template.

[0014] By adopting the above technical solution, after the waterstop screw is passed through the outer and inner formwork in sequence, the first and second limiting rings abut against the outer and inner formwork, respectively, and then the inner formwork is tightened with nuts. The first and second limiting rings are fixed to the spacing between the outer and inner formwork, reducing the tilt of the outer and inner formwork and facilitating the control of the thickness of the poured concrete. Using removable waterstop screws to secure the inner and outer formwork of the box culvert's exterior wall maintains the wall thickness, which to some extent helps prevent formwork explosion.

[0015] Optionally, a first connecting hole and a second connecting hole for the water-stop screw to pass through are respectively provided on the outer template and the inner template, the aperture of the first connecting hole is larger than the aperture of the second connecting hole, and the first limiting ring closes the first connecting hole.

[0016] By adopting the above technical solution and setting the first connecting hole larger than the second connecting hole, the installation of the water-stop screw is facilitated.

[0017] Optionally, a concrete cushion layer is provided under the inner formwork, and two ends of the concrete cushion layer abut against the outer formwork on both sides.

[0018] By adopting the above technical solution, the outer formwork is padded by the provided concrete cushion layer, which facilitates the leveling of subsequent construction and facilitates the progress of construction.

[0019] Optionally, a rubber seal is provided on one side of the first limiting ring and the second limiting ring close to the nut.

[0020] By adopting the above technical solution and setting the rubber seal, leakage of small joints caused by solidification of steel bars and concrete can be directly prevented, thereby avoiding the leakage path and effectively achieving waterproofing.

[0021] In summary, this application has the following beneficial technical effects:

[0022] 1. When repairing municipal pipelines, dig a trench in the ground, and then insert multiple steel sheet piles in sequence into the excavated trench so that the outer formwork abuts the inner side of the steel sheet piles. Then, arrange the steel mesh, and then install the inner formwork on the side of the steel mesh away from the outer formwork. Then, connect the inner and outer formworks through the connecting assembly, and pour the concrete. With the above arrangement, there is no need to remove the formwork, and no lifting equipment is required, thereby reducing space occupancy, shortening the road occupation time, and reducing the impact on traffic. In addition, the excavation is small, and the optimization of the formwork process means that the outer formwork does not need to be disassembled, and can be permanently left in the foundation pit for support, and it is convenient to pull out the steel sheet piles later, because the steel sheet piles only need to be pulled out of the channel steel groove, and do not need to be disconnected from the outer formwork. This side formwork process can reduce the disassembly work and operation complexity during the construction process, achieving the purpose of saving construction space, reducing costs, shortening construction period, and improving construction efficiency;

[0023] 2. The setting of cross steel bars makes it easier to correct the inner formwork through the outer formwork, and can increase the contact area and improve the stability of the outer and inner formwork;

[0024] 3. Through the setting of rubber seals, leakage of small joints caused by solidification of steel bars and concrete can be directly prevented, thereby avoiding the leakage path and effectively achieving waterproofing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic structural diagram of a side formwork structure of a cast-in-place box culvert in a confined space according to an embodiment of the present application;

[0026] FIG2 is a front view of the inner and outer templates according to an embodiment of the present application;

[0027] FIG3 is a cross-sectional view of the inner and outer templates according to an embodiment of the present application;

[0028] FIG4 is an enlarged view of A in FIG3 .

[0029] Figure numerals: 100, steel sheet pile; 200, outer formwork; 210, first connecting hole; 220, second connecting hole; 300, inner formwork; 400, connecting assembly; 410, limit piece; 420, water-stop screw; 430, nut; 440, first limiting ring; 450, second limiting ring; 460, rubber seal; 500, polystyrene board; 600, concrete cushion. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below with reference to Figures 1 to 4 .

[0031] An embodiment of the present application discloses a side formwork structure for a cast-in-place box culvert in a confined space.

[0032] Referring to Figures 1 and 2 , the side formwork structure for a cast-in-place box culvert in a confined space includes two rows of steel sheet piles 100 inserted into an excavated trench, a concrete cushion 600 laid between the two rows of steel sheet piles 100, two outer formworks 200 positioned adjacent to each other, an inner formwork 300 positioned between the two outer formworks 200, a connecting assembly 400 provided on the outer formworks 200 for connecting the inner formworks 300, and a steel mesh disposed between the inner formworks 300 and the outer formworks 200. When repairing a municipal pipeline, a trench is first excavated, the steel sheet piles 100 are sequentially inserted into the trench, the outer formworks 200 are then abutted against the steel sheet piles 100, the steel mesh is then arranged, the inner formwork 300 is placed between the two outer formworks 200, and the inner formwork 300 and outer formworks 200 are connected using the connecting assembly 400. Finally, concrete is poured.

[0033] Each steel sheet pile 100 can be a single, corrugated steel sheet or formed by inserting multiple C-shaped channel steels. To facilitate subsequent removal of the steel sheet piles 100, a 20mm thick polystyrene sheet 500 is placed between the steel sheet piles 100 and the outer formwork 200. The outer formwork 200 utilizes a 10mm thick cement pressure plate, which abuts the concrete cushion 600. The inner formwork 300 utilizes a 10mm thick cement pressure cylinder with chamfered edges. The inner formwork 300 is positioned above the concrete cushion 600.

[0034] Referring to Figures 3 and 4 , the outer formwork 200 is provided with a plurality of first connection holes 210, and the inner formwork 300 is provided with a corresponding plurality of second connection holes 220. The connection assembly 400 includes a waterstop screw 420, the first end of which passes through the first and second connection holes 210, 220, respectively. A limit member 410 is provided at the first end of the waterstop screw 420. The limit member 410 is a cross-shaped steel bar that is fixedly connected to the first end of the waterstop screw 420 and abuts against the side wall of the outer formwork 200 away from the inner formwork 300. A nut 430 is threadedly connected to the second end of the waterstop screw 420. The nut 430 is located on the side of the inner formwork 300 away from the outer formwork 200 and abuts against the inner formwork 300.

[0035] To facilitate limiting the spacing between the inner template 300 and the outer template 200, the first connecting hole 210 is larger than the second connecting hole 220. A first limiting ring 440 and a second limiting ring 450 are fixedly connected to the water stop screw 420. The first limiting ring 440 and the second limiting ring 450 are both annular, and the diameter of the first limiting ring 440 is larger than the diameter of the second limiting ring 450. The first limiting ring 440 seals the first connecting hole 210, and the second limiting ring 450 seals the second connecting hole 220.

[0036] To further reduce slurry or water leakage, a rubber seal 460 is fixedly attached to the first and second limiting rings 440, 450 on the side closest to the inner template 300. This rubber seal 460 is a truncated cone-shaped rubber seal. The rubber seal 460 attached to the second limiting ring 450 is smaller than the rubber seal 460 attached to the first limiting ring 440. The largest end of the rubber seal 460 attached to the second limiting ring 450 matches the size of the first connection hole 210, and the end closest to the inner template 300 is the smaller end. The smaller ends of the two rubber seals 460 are inserted into the first and second connection holes 210, 220, respectively.

[0037] The side formwork structure for a cast-in-place box culvert in a confined space according to the present embodiment is implemented as follows: When repairing a municipal pipeline, a trench is first excavated. A concrete cushion layer 600 is then laid at the bottom of the trench. Two rows of steel sheet piles 100 are then sequentially inserted into the trench, positioned on either side of the concrete cushion layer 600. An outer formwork 200 is then placed adjacent to the two rows of steel sheet piles 100, with 10 mm thick polystyrene sheets 500 inserted between the steel sheet piles 100 and the outer formwork 200. A steel mesh is then arranged. An inner formwork 300 is then placed between the two outer formworks 200, and a waterstop screw 420 is sequentially inserted through the first and second connecting holes 210 and 220, with the cross steel bar abutting the side wall of the outer formwork 200 away from the inner formwork 300. A first retaining ring 440 with a rubber seal 460 is inserted into the first hole, and a second retaining ring 450 with a rubber seal 460 is inserted into the second connecting hole 220. Then carry out concrete pouring, and after concrete solidification is completed, steel sheet pile 100 is pulled out. Here, inner formwork 300 and outer formwork 200 can be not removed, to shorten the construction period and facilitate subsequent maintenance.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A side formwork structure for a cast-in-situ box culvert in a confined space, characterized in that: The invention comprises a steel sheet pile (100), an outer formwork (200), an inner formwork (300) and a connection assembly (400), wherein a plurality of the steel sheet piles (100) are inserted into an excavated trench, the outer formwork (200) is located inside the steel sheet piles (100), and the steel sheet piles (100) support the outer formwork (200); the inner formwork (300) is located inside the outer formwork (200) and a gap is left between the inner formwork (300) and the outer formwork (200), for arranging a steel mesh and pouring concrete; and the connection assembly (400) is arranged on the outer formwork (200) for connecting the inner formwork (300).

2. The side formwork structure of the cast-in-situ box culvert in a confined space according to claim 1 is characterized in that: A polystyrene board (500) is filled between the steel sheet pile (100) and the outer formwork (200).

3. The side formwork structure of the cast-in-situ box culvert in a confined space according to claim 1, characterized in that: The connection assembly (400) comprises a limiting member (410), a water-stopping screw (420) and a nut (430); the water-stopping screw (420) passes through the outer template (200) and the inner template (300) and is threadedly connected to the nut (430); the limiting member (410) is arranged on the water-stopping screw (420) and is located on a side of the outer template (200) away from the inner template (300).

4. The side formwork structure for cast-in-situ box culvert in confined space according to claim 3, characterized in that: The limiting member (410) is a cross steel bar.

5. The side formwork structure for cast-in-situ box culvert in confined space according to claim 3, characterized in that: A first limiting ring (440) and a second limiting ring (450) are provided on the water-stop screw (420), wherein the first limiting ring (440) is located on a side of the outer template (200) away from the inner template (300), and the second limiting ring (450) is provided on a side of the inner template (300) close to the outer template (200).

6. The side formwork structure for cast-in-situ box culvert in confined space according to claim 5, characterized in that: The outer template (200) and the inner template (300) are respectively provided with a first connecting hole (210) and a second connecting hole (220) for the water-stop screw (420) to pass through, the aperture of the first connecting hole (210) is larger than the aperture of the second connecting hole (210), and the first limiting ring (440) seals the first connecting hole (210).

7. The side formwork structure for a cast-in-situ box culvert in a confined space according to claim 1, characterized in that: A concrete cushion layer (600) is provided below the inner formwork (300), with both ends of the concrete cushion layer (600) abutting against the outer formwork (200) on both sides.

8. The side formwork structure for a cast-in-situ box culvert in a confined space according to claim 6, characterized in that: A rubber seal (460) is provided on one side of the first limiting ring (440) and the second limiting ring (450) close to the nut (430).

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